Preheat oven to 180C (350F).

Line a 7x11x2 inch baking pan with parchment paper.

Grease the parchment paper lightly.

In a large bowl, combine the oil, brown sugar, granulated sugar, egg, milk, vanilla, and salt.

Beat on medium speed for 2-3 minutes until the sugars have dissolved.

In a separate bowl, combine oats, buckwheat flour, flour, baking soda, and chocolate chips.

Stir until well combined.

Add the dry ingredients to the wet ingredients and mix well.

Transfer the mixture to the prepared baking pan and spread uniformly.

Optionally, spread melted strawberry preserves on top.

Bake for 15-20 minutes until golden brown.

Remove from the oven and spread the melted dark chocolate over the top.

Allow to cool completely until the chocolate is firm.

Chill in the refrigerator for about an hour to allow the chocolate to set.

Cut into bars or squares.

Store tightly covered in the refrigerator, especially in warm weather.